Horse portrait started

I am currently working on a horse pastel portrait showing three horses. Two are Norwegian fjord horses and one is a Shetland X pony. Here's a (not so great) photo of the pencil draft. I'll post some work in progress scans as I go along.

The composition mirrors the fact that the two Norwegian fjords look after the young Shetland cross in 'real life'. The client was very happy with the pencil outline.